The subject has been the main topic of discussion for several weeks now, so using site search might be helpful if you want to get a thorough grounding in what's happened.

If i don't have access to remove some unnatural links or placed by some other person how I can request G not to consider those links.

Lots of people are asking that question, and there's probably no one answer. It most likely varies according to circumstance, how hard you try to remove the links, and whether Google might like your site for other reasons. This thread discusses the problem under one set of circumstances at length....

hi please advise what to do guys, i have just opened webmaster central, and when i checked sites that links to me i saw a 1,526,209 links from one source ! i checked the source page rank and its pr=0 , there is also others everyone of them with some 100 links to me, what to do guys , i heard google may ban me for this ! im so afraid, when i check from google link search with link:domain i dont see them. thanks in advance .